This product is amazing, I tried installing a stereo without it but because the car was missing a cable (ie not included) for example, switchable ACC cables, Ilumi and some others so I tried this item and now I have full functionality in my built in radio plus all the safety horns and some new ones like directional lights that I didn't have before so if you do I see your GM car doesn't have all the wiring you need to install, chances are you need it, and the price couldn't be better. I almost buy it at Walmart for over $66. The only downside I see is that when it's in the radio jack the chime doesn't sound that good so make sure you find a way to mount it outside and oh n should work much better.
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